"The result was that women ended up going far bigger than I, or they, expected," Dr. Henley told the Daily Mail. He said the most popular size ended up being a D cup rather than a C cup, which is what he most recommends.

Historically, Dr. Henley says, women have erred on the side of caution when choosing a new size and have gone the smaller route. By giving his patients a padded bra that comes with extra gel fillers, they get to try everyday activities such as grocery shopping or jogging with a range of twins.

Sarah Glanville told the Daily Mail that she decided to go for DD breasts after trying Dr. Henley's bra.

"I never thought I’d go for a DD, but I found I liked it, and it didn’t look odd given the shape of the rest of my body. Wearing the bra gave me the confidence to do that," she said.

While the underlying idea seems to be to help patients get used to their new girls, Gerald Imber, M.D., and author of the Youth Corridor, says that because implants are under your skin, and not something you wear, it could be hard to know if you're making the right decision.

"The problem is stuffing implants into a bra is artificial and not much different than stuffing anything else into a bra," he says. "Breast implants are real and behave as part of you."

Additionally, many women often say they don't want to make a huge change, Dr. Imber says. "However, there is something to the fact that those women, three months after surgery, feel they should have gone larger. This method would allow them to compare size, if not feel," he tells SHAPE.

What do you think? Are you considering getting or have you ever gotten breast implants? Do you wish you could have "test driven" a new pair before having surgery?